Check Door Lock Switch

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

Wiring diagram:

Door lock control system Ref. to WIRING SYSTEM>DOOR LOCK CONTROL SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using Subaru Select Monitor, display [Manual lock SW input] in [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR
Does the display change as [OFF] ←→ [ON] when each door lock switch (driver's and passenger's seats) is moved to LOCK?

Yes : Go to 2.

No : Go to 3.
CHECK DATA MONITOR .
Using Subaru Select Monitor, display [Manual unlock SW input] in [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR

Does the display change as [OFF] ←→ [ON] when each door lock switch (driver's and passenger's seats) is moved to UNLOCK?

Yes : The door lock switch is OK.

No : Go to 4.
CHECK DOOR LOCK SWITCH .
1. Turn the ignition switch to OFF.
2. Disconnect each door lock switch (driver's and passenger's seats) connector.
3. Check the continuity between terminals when moving each door lock switch (driver's and passenger's seats) in LOCK direction.
  Terminals
  
  Driver's side
  
  No. 9 - No. 1:
  
  Passenger's side
  
  No. 7 - No. 3:
Did the indicator change from "No continuity" (1 MΩ or more) to "Continuity exists" (less than 10 Ω)?

Yes : Go to 4.

No : Replace the power window main switch or switch power window sub front. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH
CHECK DOOR LOCK SWITCH .
Check the continuity between terminals when moving each door lock switch (driver's and passenger's seats) in UNLOCK direction.

Terminals

Driver's side

No. 8 - No. 1:

Passenger's side

No. 2 - No. 3:

Did the indicator change from "No continuity" (1 MΩ or more) to "Continuity exists" (less than 10 Ω)?

Yes : Go to 5.

No : Replace the power window main switch or switch power window sub front. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH
CHECK HARNESS .
Measure the resistance between each door lock switch (driver's and passenger's seats) connector and chassis ground.

Connector & terminal

Driver's side

(Df32) No. 1 - Chassis ground:

Passenger's side

(Df33) No. 3 - Chassis ground:

Is the resistance less than 10 Ω?

Yes : Go to 6.

No : Repair or replace the defective part.
CHECK HARNESS .
Check the harness between body integrated unit and each door lock switch (driver's and passenger's seats).

Connector & terminal

Driver's side

(Df32) No. 9 - (i82) No. 32:

(Df32) No. 8 - (i82) No. 12:

Passenger's side

(Df33) No. 7 - (i82) No. 32:

(Df33) No. 2 - (i82) No. 12:

Is harness normal?

Yes : Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT

No : Repair or replace the defective part.